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The T42 37mm GMC was the first step in a series of designs that led to the M18 76mm Gun Motor Carriage 'Hellcat'. The T42 was designed by General Motors and had a lower profile than the M10 Gun Motor Carriage. It was to use Christie suspension and be powered by a Wright Continental R-975 engine. It was armed with an M6 37mm gun. Work on the T42 began in December 1941, but didn't progress beyond the design stage. On 1 April 1942 the Army decided to move to a 57mm gun, and the T42 was abandoned in favour of the upgunned T49 57mm GMC.